Madill
- County:
- Marshall County
- County Seat:
- Yes
- Area (mi²):
- 4.417
- State:
- Oklahoma
Madill is a city located in Marshall County, Oklahoma. Madill has a 2026 population of 4,084. It is also the county seat of Marshall County. Madill is currently growing at a rate of 1.49% annually and its population has increased by 4.77% since the most recent census, which recorded a population of 3,898 in 2020.